Make-up post for rotary-drilling apparatus



E. E. GREVE MAKE-UP POST FOR ROTARY DRILLING APPARATUS- March 30 1926.

Filed Feb; 2a, 1923 mum-on Patented Mar. 3Q, 1926.

UNITED STATES EDGAR E.

MAKE-UP rosr non norARY-nnr LIiie arrnna'rns. ,7 I

Application fi ea February 28, 1923. semi ire/621.795.

To all whom it may concern:

Be it known that I, EDGAR E. Gnnvn, a

citizen ofcthe United States residing at Bellevue, in the county of Allegheny and State of Pennsylvania, liave' invented certain'ncw and useful Improvements in Malta Up Posts for Rotary-Drilling Apparatus, of

which the following is a specification.

This invention is for means for a make-up tong post for use in connection withrotary well drilling apparatus. y

In the art of rotary well drilling, the modern rotary is so constructed that the part thereof which holds the pipe or drill stem in suspension may be held stationary, while another part, called the gear ring, is rotated. In; adding a section of pipe toa drill stein,

that is, in making up a joint, a tongattached to. the section. of pipe to be added is rotated by engagement with a post on the gear ring,

while the drill stein isheld against movement The sections of drillpipe are generally pro- I vided with threaded box and pin connecby reference to the of the invention done, and when motion is transmitted to tlie'tong by the post one section isscre'wed into the other. If the rotary isnot stopped the instant the thread is taken up, the tong is liable to be damaged or damageresult to some other part of the apparatus.

The present invention has for its principal object to provide a yieldable means between the tong and the table having suflicient resistance to transmit motion tothe tong under normal circumstances, but which will yield or release the tong when the thread is taken up.

The invention may be readily understood accompanying drawings, in which: 1 r

Fig. 1 represents a side elevation of a pre-- fei-red form of the invention appliedtoa rotary; l

Fig. 2 is a side elevation of another form another vided with a series of holes '29 therein.

Aim ICE-j I GREVE, or BELLEVUE', rEi rNs'YtvAnrA.

is a pin or bolt 6 which serves to pivotally I support, a bell crank lever? having a we cally extending tong engaging arm 8 and a downwardlycurved arm 9. I

. The post t") is slotted at Y10 and passing throughthe slot is ai'od' 11 having one 'e'nd thereof attached to the curved" arm ,9 of the lever. A compression spring 12 surrounds the other end of the rod and isfconfinedbetween the post and awasher 13 on the end of the rod. The inner end of the-spring preferably bears against a block 14 having 'a spherical seat in the post." 'lheeffective tension of the spring may be'varied by adjusting nut 13 on the end ofthe "rod.

. InFig. 1 of the drawing, B, designates the end of a pipe tong in engagement with the upper arm 8 of thelever. This is the usual relation of the parts in the operation 'offscrewing up a section of drill stem. The

resistance of spring-12 norn'ially holds the pressure of the spring, and the lever rocks backwardly, as indicated by the dotted lines of Fig. 1, allowing the post to move on past the wrench. thus avoided. l

A compression 'spring'15 around the rod 11 is preferably'provided to cushion the return movement of the lever when .it springs back to normal position.

In the form of the device shown in Fig. 2, the post 201'carriesa .pivotally supported tong engaging member 21 pivotallysupported at 22. A leaf spring 28 secured to Breakage or injury to parts is the post, in any! suitable way, as by clamp 24, has its free end bearing against the lever to resist movement when .tu'rnmg the tong."

llvhenthe'resistance of the tong to turning becomes too great, however, the lever will rock back and allow the post toride past the tong, as described in connect on with Fig. 1.v

parts in thisposition. When, however, the threads have been taken up, the resistance of r the tong to further movement overcomesthe Q In the device shown in Fig.3, a bell crank of the post as in Fig. 1, the lever having anormally vertical tong engaging arm 26 and a normally horizontal arm 27. The tong engaging arm 26 may have a tong engaging plate 28 clainped thereto, preferably in such manner that it may be adjusted vertically.

The horizontal arm f is preferably pro.-

"lever 25 is pivotally supported at the top cured to the post is an arm 30 having a vertically slidable rod 31 passed through a slot the hell erzinlr is mounted reversely to the therein. The upper end of therod is atv taohed to the horizontal a-nn hy 'a'bol't passing through one of the openings therein.

' The rod is urged downwardly by a compressionspring 32'confined'betweenWasher 33 on" its lower end and blook-34 having a, spher cal sentin the arm; Arm 30 is preferably clamped to the pos't 'in such manner thatit may he sdpisted vertically to providea simple adjustment for the spring. {By attach- Lhig thezrodtothe leveret different holes,'the;

Gi'i CCtlVG ten sion o fi the spring may also be varied. Y 7 I Vlthwt'he"construction shown 111 Fig. 4,

oneshOwn in Fitz. 3i Ziheibell'crenk )iV- otallj supported M35, has 21 ertical jnrni "36 and n rearwnrdly extending; arnr37. De--' "neotedwith a second lever "pending f1'o1narin'37 is a link 88. Strapped" orotherwlsesecured to the post is a lever rlrin 39"Wh0se enter end is opivotaii-y con- 7 4- The inner end 0'1": lever 40 min t-heform of a yoke, to

partly encircle th e post; and rests on a" sprlng oapr-rorwasher'ig' ntthe upper end 01? fs'pringji h 'embramngrthe post.

The lower "end of the spring preferably rests on zine-d- 'ustahle' nut 45 on the nest; The lower end 3 o i V v of link 38 is pivotally' conneetedto lever 4:0. Consequently, the springid-"e1 ys urges the tong engaging arm toward vertical position,

but, when the resistance ofthe tong becomes sui'lioient ly great; the spring will yield to allow the post tomo ve past the tong.

' The various embodiments, herein described aremerelyillustrative of my invention, and

various changes and modifications may be 7 made 111t'llGCOllEfiiTfiCtlOD thereofwithin the contemplation of lnyinvention'end Within the scope of the appended iolnnn; Eclann esniy inventlon-z A nnihe-up post for rotary well'vodrilling' 'itppiirntlis' COIDPIlSlHQ" apost-,1 at o-armed lever piivotally ezirriet at the top ofthe post,

one arm o'fseid lever being a ton-g engaging abnormal position.

In testimony Where'oFfI my signature "EDGAR GREVE. 

